RT - Journal Article T1 - Exposure to Methyl Methacrylate and its Subjective SymptomsAmong Dental Technicians,Tehran-Iran JF - IOH YR - 2006 JO - IOH VO - 3 IS - 2 UR - http://ioh.iums.ac.ir/article-1-476-en.html SP - 6 EP - 0 K1 - Methyl Methacrylate (MMA) K1 - dental technicians K1 - dental laboratories K1 - health symptoms K1 - Time- weighted Average (TWA) Concentration K1 - Peak Concentration AB -   Background and aims   Methyl Methacrylate (MMA) which is known as a long, skin and eye  irritant is the most common form of acrylic plastic used in dental laboratories. The aims of this study were to evaluate dental technicians, exposure to MMAand to assess their health with a focus  on respiratory and dermal symptoms.   Methods   Exposure to MMA, total dust and health symptoms were investigated in 20 dental  laboratories located in Tehran, Iran. Time weighted average (TWA) of MMA and peak  concentrations were determined , using XAD-2 tubes followed by GC-ID analysis. Total dust  were evaluated gravimetrically. Health symptoms were asked using a questionnaire.   Results   The TWAfor technicians with direct and indirect exposure to MMAwere 327.28 + 79.42  and 282.9 + 41.84 mg/m3, respectively. Peak concentration of MMA for those technicians were  337.0 + 36.81 and 328.88 + 45.40 mg/m3, respectively. There were no significant differences  between TWAof MMAand peak concentration in different weakly workdays low ever, within -  day variations were observed (P LA eng UL http://ioh.iums.ac.ir/article-1-476-en.html M3 ER -